My muddled thoughts after having played about 30 hrs since launch ( I'm now lvl 40 something - mostly support & recon ).
1. The CZ is too small and makes 90% of the map redundant.
2. Progression is too slow at the moment. This becomes very noticeable once you rank up a role to rank 10+ ; the devs have implemented a "handicap" mechanic which slows down progress significantly every 10 lvls or so. Basically means that most players won't get anywhere near to unlocking all the various counters / gear etc before progress is wiped for a new season.
3. Communication systems need some work. There needs to be a global team voice chat to facilitate comms between squads ; proximity chat has limited use due to range and the fact that is an unsecure channel. There is text chat with a "team all" toggle, but this isn't convenient to use in the thick of the action on the frontlines. I think this "hole" in comms is contributing to a lack of co-operation in some matches.
4. Weapon imbalances. SMG's seem way overtuned at the moment - accuracy/range/damage all too high. Sniper rifles are undertuned ... can take 3-5 headshots to get a kill using a high lvl sniper rifle versus someone with T2 /3 armour.
5. Which brings me on to my next observation - the higher tier unlocks provide a massive advantage over a player who doesn't have the time to grind lvls all day long. Starter weapons / armour needs to be stronger, imo.
6. Fortified FOB's / camping ( "fobbits"

) seems to be the "meta" at the moment ... but if more players had access to higher tier equipment eg. armoured vehicles, tanks, artillery, C4 etc it wouldn't be an issue.
7. There have been several instances where I've unloaded several sniper rounds into a stationary player at close range and failed to hit or do any damage. Don't think they are cheating, seems to be a networking / hit registration problem.
8. Helis are making vehicles redundant for troop transportation and logistics. Now, piloting isn't easy ... but there always seem to be 2-3 players on each team who are ace pilots. In matches where air support dominates ( which is most ) it is nigh impossible to level up driving ... you can try doing supply runs but you'll find that most FOBs are constructed in a way that only allow airdrops. To unlock armoured vehicles, tanks etc you need to get driving up to rank 35.
9. For the love of god, disallow players switching teams mid-match. Some players abuse this to observe where opposition squads, fortified positions etc are on the map, and will sometimes sabotage bases eg. leaving a secure door open so an assualt team can get in.
Despite all these criticisms, I'm still having fun ... and it is an EA after all, so I'm sure the devs will tinker with balancing a lot between now and full launch.